Stay-bolt for boilers.



s E, a. STAFFORD 6 E. [1000s.

STAY BOLT FOR BOILERS.

APPLICATION HLED FEB. 21. 1915.

Patented J 11116 12, 1917.

h. eras rear EENJAMIN E. D. STAFFORD AND ETHAN I. DODDS, OE PITTSBURGH, PENNSYLVANIA,-

ASSIGNORS T0 FLANNERY BOLT COMPANY,

OF PITTSBURGH, PENNSYLVANIA.

swa -near non BoILnns.

specification of Letters Patent.

Patented June 12, 19372.

Application filed February 27, 1915.v Serial No. 11,080.

2'},- all whom it may concern:

Be it known that we, BENJAMIN E. Di.

drarronn and ETHAN 1. Bonus, citizens of the United States, and residents of Pittshurgh,,in the county of Allegheny and State of Pennsylvania, have invented certainnewand useful improvements in Stay-Bolts for Boilers; andwe do hereby declare the following to-loea full, clear, and exact description of the invention, such as will enable ethersskilled in the art .to which it appertainsto make and use-the same. I

()urinvention relates to an improvement in stay bolts for, boilers, the object being to provide a simple device for attaching the bolt to the'outer sheet of the boiler, and which will permit the bolt to yield longitudi-nally and laterally, without unduly straining either of the sheets, and which will insure a tight flexible joint under any and all conditions.

Uur invention consists in a sleeve externally threaded and provided with n in ternal seat, and a yielding member aving internal threads for the attachment of the stay bolt and a shoulder to rest on said seat.

@ur. invention further consists in an integrai sleeve one end of which is threaded externally, and the other end threaded internallwthe sleeve being provided with an nal seat for supporting the internally threaded end, the portion of the sleeve inter mediate the threaded ends being yielding, and a bolt screwed to the internally threaded .d c i the sleeve. I

@ur invention further consists in the parts and combinations of parts as will be more :tnlly explained and pointed out in the claims.

the accompanying drawings Figure 1 is a view partly in section and partly in elevation of one embodiment of my invention and Figs. 2, 3 and l are similar views of modified forms.

1 represents a rigid bolt having threaded ends, one of which is secured directly to the inner sheet 2 of the fire box or boiler and the other the sleeve or bushing 3 screwed into ovided with external, threads for its at a taehment to the outer sheet 4; with an anguother tool emnlo surfaceh to be engaged by a wrench or to: 0 "E i fi h n the curved, and the end 79. of

e outer sheet. This sleeve or bushing 3 is,

sheet at, and at its outer end 6 with a bore internally threaded to receive the outer end of'the' bolt 1. v

The outer end 6 of the sleeve projects inwardly, into saidsleeve, and is provided,

in Fig. 1 with a rounded end 7 which is nor-' curedto the internally threaded portion of the sleeve, and may be locked therein by upsetting the end of the bolt;

Normally -the rounded end 7 oflthe internally threaded portion rests on the curved of the necessary I seat 8 inflthe sleeve proper and takes all the expansive stresses to which the bolt. is subjected, the spring portion 9 of the sleeve sustaining the bolt only duringa. collapsing movement of the sheets, and "compensating for expansion of the bolt.

The construction shown in Fig. 2 is substantially identical with that sho'wnin Fig. 1, except that the seat SEis flat instead of the internally threaded section 6 is widened out and but slightly curved so as to have a free rocking movement on the seat 8'. i

In Fig. 3 the outer end of the sleeve is turned inwardly 'as at 11 and then outwardly as at 7", the shoulder or bend at the junction of the inwardly and outwardly bent portions resting on the seat or shoulder 8 within the sleeve. This construction, by

reason of the increase in the length of the spring portion of the sleeve, provides for greater flexibility and freer movement/of the internally threaded portion of the sleeve to which the outer end of the bolt is secured.

In the construction shown in Fig. 4 the sleeve is made of two parts 3 and 6. The main or body portion 3 of the sleeve is externally threaded for its attachment to a boiler sheet and also externally threaded for the attachment of the outer part 6, the free end of the internally threaded portion of the part 6 resting on the seat 8 which ma he'inclined as shown; In other-respects it s v to which they are subjected in use.

By increasing the number of folds, or increasing the length of the spring section, sufiicient elasticity will be provided to absorb or take care of all necessary longitudinal and lateral and vibratory movements to which the bolt may be subjected due to the expansion of the bolt itself or to ion itudinal and lateral movements of the bo t due to outward or lateral movement or buckling action of the inner sheet, and provides in efi'ect for universal movement of the outer end of the bolt. The construction also in-. sures a tight flexible joint under any and all conditions.

Having fully described our invention what'we claim as new and desire to secure by Letters-Patent, is

1. In stay bolt construction, a sleeve,externally threaded and provided with an internal seat, and a yielding member projecting outwardly from the outer end of said sleeve, and provided with. a shoulder to engage the seat within the sleeve, the said yielding member adapted to snpport the outer end of the stay boi" 2.11m stay bolt eons't ternally threaded and in ternal seat, and a yielding member projecting outwardly from the outer end of said sleeve, and also projecting inwardly into the sleeve and provided with a shoulder to rest with internal thread for the attachment of a stay bolt.

In testimony whereof, we have signed this specification in the ing witnesses.

BENJAMIN n. erni ronn' ETHAN I. DODDS.

Witnesses EDv'IN S. Even, F. H. ALLISON.

presence of two subscrib- 

